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W. 0. BAKER.

STEAM HEATER No. 44,038. Patented Ai1g-.30, 1864 UNITE STATES PATENT OFFICE.

W. O. BAKER, OF NEW YORKJ N. Y., ASSIG-NOR TO HIMSELF AND JOHN J. SMITH, OF SAME PLACE.

AUTOMATIC AIR-DAMPER FOR HOT-W'ATER' HEATING APPARATUS,-

Speciiication forming partof Letters Patent No. 44,038, dated August 230, i834.

To all whomit may concern: Be .it:known that l, W.C. BAKER, of New York, county of vNew York, .in..- the State of New. York, have invented a new,an'd' useful improvement in apparatus for supplying heated air .tobnildin gs,'&c.; and I do hereby declare that the following is a full and exact description thereof, reference being bad to the accompanying drawing, making part of this specification.

My invention relates to a novel method of regulatingthe temperature and supply of heat-- ed air derived item that 'kind of heating-apparatus in which a supply of cold air passes through a radiator or heater-composed "of pipes (or other surfaces) heated by hot water, and thence to the apartment or place to be warmed; and my invention has for its object to render this kind of heating apparatus capable of an automatic or selfregulation', which shall insure an'even tern erature' to the supply' of' heated air afi'ord'ed byitduring any'a'nd all variations of tem'peraturein its radiator or heater and to this end my invention consists in the: e'm ployinent, --'in the pipe or --pass'age through. which cold ai'r'jis suppliedto theradiatoiycf a damper'or valve so connected with :the water--,.

means of a pipe, 1. By this arrangement a circulation of hot water is kept upbetw-een the boiler-and. radiator, (and through -the pipes of-its coil,) as indicated by the black arrows in the drawing, in the manner well known to those familiarwith hot water heating apparatuses. i

S is a pipe or passage through which cold air is supplied to the box D of the radiator, where it is'heated, and from where it passes through the exit-pipe T to the place or places to be warmed. In the cold-air passage S there is arranged a damper or valve, Z, which is opened and closed by'means of an arm or lever is arranged outside of conduit S. This valve-arm k is connected to a piston-rod, j, which extends vertically up from a piston" in the cylinder h, which latter is connected directly by means of -a pipe-,1, to the waterchamber of the boiler.- m is'a weight attached to thea'rm k, and exerting a constant tendency to. move said arm in such a direction .as'to close the valve or damper lin the cold-air passage S. In the drawing the red arrows indicate the direction of the currents of air passing through thesupply-pipe S to the radichamber of the boiler which supplies said radiator as to be operated by the expansion and contraction of the waterin said chamber, and thus automatically vary the supply of cold air to the radiator as the condition of temperature of water supplied to said radiator varies,

all as hereinafter more fully explained.

To enable those skilled in the art to make and use my invention, I will proceed to describe the construction and operation of one of my improved hot-water heating apparatuses, referring by letters to the accompanying drawing, in which -I :have represented in elevation a boiler, a radiator, and the connections thereof, sufficiently to illustrate my invention. I have shown the radiator with the front side of its box removed.

A represents the furnace, having doors b and c, and within which is arranged the waterchamber or boiler .in the usual manner. lhe radiator is composed of a box, 1), within which is arranged a coil of pipes, 0, connected at its upper. part to the top of the boiler by means of a pipe, f, and at its lower part to the lower portion of the boiler or water-chamber by ator, into and ar'ou'nd thc coil'ot' the latter, and thence out througlrtlie exit-pipe T.

The-water being heated, and the coil of the radiatorsupplied in the'usual manner through the pipes f and g, the; damper or valve 1 is opened sufiiciently toallow a quantity of cold air to pass to the radiator, in which it is heated tothe proper temperature, and from whence it is supplied to the place or apartments to-be warmed. The damper and piston-rod j and weight m, being properly arranged andadjusted, the damper l, it will be seen, will be opened more or less inst as the piston is raised or allowed to descend by the expansion and contraction of the heating medium, (the water.) A ow, since the capacity of the radiator to heat to a given temperature different volumes of cold air varies justas the temperb always supplied with just the quantity of c ld air which it will have the capacity to heat to a given temperature, and that thus during the fluctuations of the temperature of the heating medium (and of the air to be heated) a uniform temperature in the heated air discharged from the radiator will be maintained, thus gaining a great desideratum in hot-water heating apparatus.

I am aware that the supply of cold air to a steam-heated coil has been regulated by the pressure of the steam in the boiler, and do not wish my claim of invention to be confounded with such an apparatus. Neither do I wish to limit my invention to the precise mode of construction shown, or many details of the apprratus, the gist of my invention resting in the idea of varying the supply of cold air to the radiator automatically by the expansion and contraction of the water which constitutes the heating medium of the radiator. In the practical application of my invention I shall probably emplpy a diaphragm in lieu of the piston here shown. g

Having explained my invention in hot-water heating apparatuses, what I claim as new, and desire to secure by Letters Patent, is-

Regulating the supply of cold air -to the radiator or heater automatically by the varyin g temperature of the water employed to heat the radiator, substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand and seal this 27th day of June, 1864.

W. G. BAKER. [1 s] In presence of- HENRY N. SAWYER, E. A. HULEN. 

